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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi FJA4210RTU

Name: FJA4210RTU
Brand: onsemi
SKU: FJA4210RTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FJA4210RTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-3P-3, SC-65-3

Datasheet:: FJA4210RTU.pdf

Description:: TRANS PNP 140V 10A TO-3P

Quantity:: RFQ Add To RFQ list

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Inventory:5,725

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Product details

Overview

FJA4210RTU from Fairchild Semiconductor is a PNP epitaxial silicon power transistor designed for high-current audio amplifier output stages, featuring -140 V V_CEO, -10 A I_C (DC), 100 W P_C at T_C = 25°C, and 30 MHz f_T; used in Class-AB push-pull audio power amplifiers driving 4–8 Ω loudspeakers.

For engineers reviewing the FJA4210RTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) robustness at high V_CE, low V_CE(sat) under high current, h_FE classification consistency (R/O/Y bins), and TO-3P thermal performance in linear-mode operation.

Technical Context

The FJA4210RTU operates as a linear PNP bipolar junction transistor with complementary pairing to the NPN FJA4310, enabling symmetrical push-pull amplifier designs. Its wide forward-bias SOA supports sustained operation at high voltage and current combinations without secondary breakdown.

Designed for analog power amplification, it delivers stable DC current gain (h_FE = 50–180 at V_CE = −4 V, I_C = −3 A) and low saturation voltage (V_CE(sat) = −0.5 V at I_C = −5 A, I_B = −0.5 A), critical for minimizing thermal stress in Class-AB output stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−140 V: Maximum collector-emitter voltage before breakdown; enables use in ±70 V rail audio amplifiers.
I_C (DC)	−10 A: Continuous collector current capability; supports >100 W RMS audio output into low-Z loads.
P_C @ T_C=25°C	100 W: Thermal dissipation limit at case temperature; requires heatsink design per derating curve (Fig. 7).
f_T	30 MHz: Current-gain bandwidth product; ensures adequate gain margin up to 20 kHz audio band with stability.
V_CE(sat)	−0.5 V @ I_C=−5 A, I_B=−0.5 A: Low saturation voltage reduces conduction loss and heat generation in output stage.
h_FE range	50–180 @ V_CE=−4 V, I_C=−3 A: Binned gain (R/O/Y) allows matched pair selection for differential amplifier symmetry.
C_ob	400 pF @ V_CB=−10 V, f=1 MHz: Output capacitance impacts high-frequency stability and slew rate in feedback loops.

Pinout & Package

Package: TO-3P (EIAJ SC-65 standard), metal-can package with isolated collector tab, rated for high-power linear operation and direct heatsink mounting.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control electrode	Receives base current to modulate collector current; requires current-limiting resistor in driver stage.
2 (Collector)	Main current path (output)	Electrically connected to metal case; must be insulated from heatsink unless system ground reference permits.
3 (Emitter)	Current source terminal	Typically tied to positive supply rail in PNP output stage; carries full load current with minimal voltage drop.

Key Features

Feature	Design Value
Wide Forward-Bias SOA	Supports simultaneous high V_CE and high I_C without secondary breakdown-critical for linear audio output reliability.
High Power Dissipation	100 W at T_C = 25°C enables high-output-power amplifiers without forced-air cooling in many enclosures.
Complementary Pairing	Engineered as PNP counterpart to FJA4310 (NPN); ensures matched thermal and electrical characteristics in push-pull designs.
h_FE Binning (R/O/Y)	Three gain groups allow precise matching of devices in differential input or push-pull output stages for reduced distortion.
TO-3P Mechanical Robustness	EIAJ SC-65 compliant package provides mechanical stability, low thermal resistance, and reliable solder-mount or clamp attachment.

Applications

High-Fidelity Audio Amplifier	Professional PA System Output Stage
Use Scenario: Discrete Class-AB power amplifier delivering 100+ W RMS into 4 Ω or 8 Ω loudspeakers with low THD+N. IC Role / Device Role / Timing Role: PNP output transistor in complementary emitter-follower configuration, handling negative half-cycle current delivery. Use Value: Wide SOA and low V_CE(sat) minimize thermal runaway risk and improve efficiency over competing discrete transistors.	Use Scenario: High-reliability output stage in touring-grade powered mixers and active line arrays. IC Role / Device Role / Timing Role: Primary PNP switching/linear device in parallel-output configurations driving low-impedance voice coils. Use Value: −140 V V_CEO headroom accommodates transient voltage spikes common in live sound environments.
Studio Monitor Power Section	Industrial Audio Signal Distribution
Use Scenario: Bi-amplified near-field studio monitors requiring clean, low-noise mid/high-frequency amplification. IC Role / Device Role / Timing Role: Final PNP gain stage in active crossover networks, biased for low-quiescent-current linear operation. Use Value: Tight h_FE binning (R/O/Y) enables matched pairs that reduce DC offset and inter-channel imbalance.	Use Scenario: Distributed audio systems in commercial buildings with long speaker runs and impedance-matching transformers. IC Role / Device Role / Timing Role: High-current output device in constant-voltage (70 V/100 V) amplifier modules. Use Value: −10 A I_C rating supports transformer primary current surges during program peaks without clipping.

High-Fidelity Audio Amplifier

Professional PA System Output Stage

Use Scenario: Discrete Class-AB power amplifier delivering 100+ W RMS into 4 Ω or 8 Ω loudspeakers with low THD+N.

IC Role / Device Role / Timing Role: PNP output transistor in complementary emitter-follower configuration, handling negative half-cycle current delivery.

Use Value: Wide SOA and low V_CE(sat) minimize thermal runaway risk and improve efficiency over competing discrete transistors.

Use Scenario: High-reliability output stage in touring-grade powered mixers and active line arrays.

IC Role / Device Role / Timing Role: Primary PNP switching/linear device in parallel-output configurations driving low-impedance voice coils.

Use Value: −140 V V_CEO headroom accommodates transient voltage spikes common in live sound environments.

Studio Monitor Power Section

Industrial Audio Signal Distribution

Use Scenario: Bi-amplified near-field studio monitors requiring clean, low-noise mid/high-frequency amplification.

IC Role / Device Role / Timing Role: Final PNP gain stage in active crossover networks, biased for low-quiescent-current linear operation.

Use Value: Tight h_FE binning (R/O/Y) enables matched pairs that reduce DC offset and inter-channel imbalance.

Use Scenario: Distributed audio systems in commercial buildings with long speaker runs and impedance-matching transformers.

IC Role / Device Role / Timing Role: High-current output device in constant-voltage (70 V/100 V) amplifier modules.

Use Value: −10 A I_C rating supports transformer primary current surges during program peaks without clipping.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE15034G	V_CEO = −150 V, I_C = −8 A, P_C = 75 W, TO-247 package; lower current but higher voltage rating.	Better suited for high-voltage, medium-current switching; less ideal for high-current linear audio due to lower I_C and P_C.	Select when higher V_CEO margin is prioritized over peak current capability.
2SA1943	V_CEO = −230 V, I_C = −15 A, P_C = 150 W, TO-3P package; broader SOA and higher power rating than FJA4210RTU.	Preferred for ultra-high-fidelity amplifiers demanding extended SOA and thermal headroom beyond FJA4210RTU limits.	Choose for new designs targeting maximum reliability at high power; verify h_FE matching requirements.

Compared with MJE15034G and 2SA1943, the FJA4210RTU offers balanced voltage/current capability and industry-standard TO-3P footprint, making it optimal for cost-sensitive, high-volume audio amplifier production where −140 V/−10 A meets design margins.

Availability

FJA4210RTU is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, professional PA systems, studio monitor power sections, and industrial audio signal distribution requiring stable component supply and consistent parametric binning.

Supply support for FJA4210RTU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The FJA4210RTU belongs to Fairchild's high-power audio transistor family, engineered specifically for linear-mode operation in high-fidelity and professional audio amplifier output stages.

FAQ

What is the maximum continuous collector current rating for the FJA4210RTU?

The FJA4210RTU has a maximum continuous collector current (I_C) rating of −10 A at T_A = 25°C. This rating assumes proper heatsinking and adherence to the power derating curve (Figure 7 in the datasheet). At elevated case temperatures, allowable current decreases linearly per the specified derating slope of 0.8 W/°C above 25°C.

Does the FJA4210RTU have a specified Safe Operating Area (SOA)?

Yes, the FJA4210RTU features a defined forward-bias SOA (Figure 6), covering DC and pulsed conditions up to 10 ms. The SOA boundary ensures reliable operation without secondary breakdown across combinations of V_CE and I_C, critical for linear audio amplifier applications where both parameters vary dynamically.

What is the purpose of h_FE binning (R/O/Y) for the FJA4210RTU?

The FJA4210RTU is binned into R (50–100), O (70–140), and Y (90–180) h_FE groups to enable precise matching of devices in push-pull or differential amplifier stages. Matching within the same bin minimizes DC offset, improves thermal tracking, and reduces even-order harmonic distortion in high-fidelity audio circuits.

Is the collector of the FJA4210RTU electrically connected to the case?

Yes, Pin 2 (Collector) of the FJA4210RTU is internally connected to the metal TO-3P package case. When mounted to a heatsink, electrical isolation (e.g., mica washer + thermal grease or silicone pad) is mandatory unless the circuit design intentionally references the collector to chassis ground.

How does the FJA4210RTU compare to its complementary NPN counterpart?

The FJA4210RTU is explicitly designed as the PNP complement to the NPN FJA4310. Both share identical TO-3P packaging, matched voltage/current ratings (e.g., V_CEO/V_BCO, I_C), SOA contours, and thermal characteristics-enabling symmetrical push-pull amplifier topologies with minimized thermal and gain mismatch.

FJA4210RTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-3P-3, SC-65-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 140 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 500mA, 5A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 3A, 4V

Power - Max:: 100 W

Frequency - Transition:: 30MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P

FJA4210RTU FAQ

1.How can I place an order for FJA4210RTU through Aetrix?

Please submit a Request for Quotation (RFQ) for FJA4210RTU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for FJA4210RTU reliable?

The price and inventory of FJA4210RTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJA4210RTU is usually 5 days.

3.What payment methods are accepted for FJA4210RTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJA4210RTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FJA4210RTU?

FJA4210RTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FJA4210RTU order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for FJA4210RTU?

For technical support, including FJA4210RTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJA4210RTU requirements.

6.How does Aetrix verify that FJA4210RTU is sourced from the original manufacturer or authorized distributors?

All FJA4210RTU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FJA4210RTU meets industry standards.

7.What is the process for return or replacement of FJA4210RTU?

All FJA4210RTU units undergo pre-shipment inspection (PSI). If there is an issue with FJA4210RTU, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The FJA4210RTU part is unused and in its original packaging.

Return procedure for FJA4210RTU:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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